I am using these molds to create solid concrete coasters. They work pretty well, but it is quite tricky to get them to come out evenly. Especially the hexagon shaped ones. No matter how hard I try, the corners always seem to be raised higher than the middle of the coaster, which isn't good. I am having to sand them down a lot, which takes more time than I would like. They release pretty well, as long as the concrete has cured long enough. I spray them thoroughly with baking spray before filling. Some of the coasters come out great, but most of them require quite a lot of work to get right. And the circle ones are huge. They seem too big for coasters. The hexagon ones are the perfect size and I love the shape. I don't think I can recommend them though. Too much finishing work required.

My children and I were able to create 8 square coasters in this kit - there are not nearly enough tiles to make all 12, which was a bit of a bummer. On the upside, the directions were pretty easy to follow, and it was an all-around great project for my 6 and 9 year olds and myself. I'll have to buy more mosaic tiles in order to make the last four coasters, however.

Our coasters came out wonderfully however, when you look at the picture in the advertisement, you can clearly see you need 25 tiles per coaster. In order to make the 12 coasters the kit claims you can make, you would need 300 tiles.

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